(CNN) - House Republican leader John Boehner will lay out a "prebuttal" ahead of President Barack Obama's prime time speech on Iraq Tuesday night.

Boehner will speak to about 10,000 people Tuesday afternoon at the 92nd American Legion National Convention in Milwaukee on Iraq and other national security issues, including Afghanistan and the Middle East.

Obama's Oval Office address is timed to coincide with the official end of the U.S. military's combat mission in Iraq.

In an op-ed published Friday in the conservative news site Human Events, Boehner said Tuesday's shift of U.S. forces from combat to an advisory mission "was made possible by the very surge that President Obama and Vice President Biden opposed."